Parser for nested Unordered & Ordered lists inside Rich Text element. Add this code before </body> in page settings. More info here: https://discourse.webflow.com/t/nested-lists-in-rich-text-element-custom-vanilla-javascript-solution-for-unordered-ordered-lists/242024/1

webflow_nested_lists.js

/* 
# Example of how to use nested lists in Rich Text element in Webflow Editor  

## Unordered list
* Step 1.
* Step 2.
* ~Step 2.1
* ~~Step 2.1.1
* ~Step 2.2
* Step 3.

## Ordered list
1. Step 1.
2. Step 2.
3. ~Step 2.1
4. ~~Step 2.1.1
5. ~Step 2.2
6. Step 3.
*/
(() => {
  const unordered_lists = document.querySelectorAll(".w-richtext > ul");
  const ordered_lists = document.querySelectorAll(".w-richtext > ol");

  function replaceChild(newItem, oldItem) {
    oldItem.parentNode.replaceChild(newItem, oldItem);
    newItem.appendChild(oldItem);
  }

  function createUnorderedList(item) {
    const list = document.createElement("ul");
    list.style = "margin-bottom: 0;";

    replaceChild(list, item);
  }

  function createOrderedList(item, start) {
    const list = document.createElement("ol");
    list.style = "margin-bottom: 0;";
    list.type = "a";
    list.start = start;

    replaceChild(list, item);
  }

  function parseUnorderedList(item) {
    const nest_level = item.innerText.split("~").length - 1;
    item.innerHTML = item.innerHTML.replaceAll("~", "");

    if (nest_level === 0) return;

    new Array(nest_level).fill(0).map(() => createUnorderedList(item));
  }

  for (const list of unordered_lists) {
    for (const item of list.children) {
      parseUnorderedList(item);
    }
  }

  function parseOrderedList(item, queue) {
    const nest_level = item.innerText.split("~").length;
    item.innerHTML = item.innerHTML.replaceAll("~", "");

    if (nest_level === queue.length) {
      queue[nest_level - 1]++;
    }
    if (nest_level > queue.length) {
      queue[queue.length] = 1;
    }
    if (nest_level < queue.length) {
      queue.splice(nest_level);
      queue[nest_level - 1]++;
    }
    if (queue.length > 1) {
      new Array(queue.length - 1)
        .fill(0)
        .map(() => createOrderedList(item, queue[queue.length - 1]));
    }
  }

  let queue = [0];
  for (const list of ordered_lists) {
    for (const item of list.children) {
      parseOrderedList(item, queue);
    }
  }
})();